Outlook Issue - You have exceeded the size limit on your mailbox

Feb 2010

Outlook Issue - You have exceeded the size limit on your mailbox

comment icon29 comment(s) |

If you are seeing the below "Mailbox Cleanup" popup in Outlook 2003 or 2007 stating "You have exceeded the size limit on your mailbox.".

It can be for several reasons, some of which are:

  • You're running on an Exchange server and your system administrator has mailbox limitations in place. You should receive warning e-mails about this condition before it surprises you though.

The solution here will be to use the Mailbox Cleanup wizard or Archive features to move some mail to a PST if you aren't able to get the limits increased.

  • You have a PST or OST file that is around from a version of Outlook prior to Outlook 2003.
  • You have exceeded the default size of the PST allowed in Outlook 2003 or 2007.
  • You are running on a FAT32 partition, instead of NTFS

For these last three items, the troubleshooting steps are similar.

First, check the size of your PST / OST file. If your operating system is Windows Vista or Windows 7, browse to:
    C:\Users\<your username>\AppData\Local\Microsoft\Outlook
If your operating system is Windows 2000 or Windows XP, browse to:
    C:\Documents And Settings\<your username>\Local Settings\Application Data\Microsoft\Outlook
If you are having trouble locating the proper folder, your profile could be located in a non-default location try entering %LocalProfile% to in the run box followed by the path after <your username> in the above examples.

Look at the size of the OST or PST file. If it's at, or close to 2GB, you're either running a FAT32 partition (check this by viewing your local disk properties in My Computer), or you upgraded from a prior version of Outlook and have an older formatted file. Both of these instances will need to be run through a conversion process. The disk conversion is considered a FAT32 to NTFS conversion, and the PST conversion is considered an ANSI PST to Unicode PST conversion. Do a quick search and you'll find several articles detailing those processes. Always create a backup before trying either of these.

If it's at, or close to 20GB, you have hit the default limit in Outlook 2003 / 2007. Microsoft KB 832925 discusses the adjustment of these settings http://support.microsoft.com/kb/832925. The quick version is that you need to make some registry adjustments to increase the limits. Registry settings for Outlook 2007 to change the warning limit to 29GB and the max size to 30GB is:


Registry settings to revert back to the default values are:


If you are running Outlook 2003, change \12.0\ to \11.0\.



June 26, 2010


increasing pst size

When I follow your directions to the path below, I do not "see" "Office" under Microsoft. I only have 2 folders, "SystemCertificates" and "Windows". Can you help?


June 26, 2010


Re: Missing registry key

That's pretty weird, all of my Office 2003, 2007, and 2010 available systems have the path available, at least to Office. The Microsoft KB article mentions that the specific keys might not exist, and they instruct you on how to create them. The registry scripts provided should fill in the tree appropriately. Hope that helps...

August 30, 2013


Configure Oversize Outlook Email

SysTools for OST to PST is great email management solution for Outlook client use on off-line mode to configure oversize Outlook OST files and restore emails from them.

November 5, 2010


Max File Size Registry Settings

The reason Bruce didn't see Office under HKLM\Software\Policies\Microsoft, is because this path is used only when group policies are pushed from AD. If his computer is not part of a domain using group policies to control Office settings, he should drop 'Profile' from the path.

January 5, 2011


Max File Size Registry Settings

HI there,

Great article thank you. However, it doesnt seem to work for me. I have windows 7 and Outlook 2007. I had to create 2 new keys n( one in the policy location and one n the user location) in the HK_Current user and have set the values to the maximum:

yet my .pst folder wont go over 1.83gb. So i have to keep deleting emails. I have tried restarting outlook and my pc, with no joy.

What else can i do/

June 23, 2011


Max File Size Registry Settings

I am having the same problems with my Win 7 64 bit machine running Outlook 2007. I rebuilt my OST file. I recreated my Outlook profile. I am still getting the error.

Any help would be appreciated.

July 22, 2011


Check your PST file format

It sounds like your PST file is still in ANSI format which has a limit of 2GB. You may have migrated at some point from Outlook 2002 or prior. The PST file needs to be in UNICODE format to increase the file size limit. Once in UNICODE format, the default maximum size should be 20GB, which can also be increased.

You can check which format is being used in Outlook by going to File > Data File Management > double-click the PST file. If the Format field shows (97-2002) it is in ANSI format, otherwise it is in UNICODE format. Here are instructions on how to convert formats: http://www.msoutlook.info/question/115

Hope this helps.


May 5, 2015


I am also have the same

I am also have the same problem. My office folders are not in the policies folder but are in two other places. I created the values in the two other locations i found office/pst folders but they are not making my pst limit larger. its becoming frustrating i have a 20gb pst and 17 archive pst's that are all 20gb as well. I receive 1000+ emails a day so it is very hard to manage this with offices lame limitations

October 30, 2012


Please,could you explain me

Please,could you explain me what you mean?

October 30, 2012


Please,could you explain me

Please,could you explain me how I can do it?

March 27, 2013


Very helpful, however what

Very helpful, however what needs to be dropped from the path is of course "Policies" (not "Profile"). So when the OST-size limit is not governed by group policy, the path is
HKEY_CURRENT_USER\SOFTWARE\MICROSOFT\OFFICE\12.0\OUTLOOK\PST (for Office2007). The PST key may need to be created.

April 20, 2011

Dan Keurig


"If it's at, or close to 20GB, you have hit the default limit in Outlook 2003 / 2007. Microsoft KB 832925 discusses the adjustment of these settings http://support.microsoft.com/kb/832925. The quick version is that you need to make some registry adjustments to increase the limits."

Hey, could you post that MS article, I can't seem to find it. Thanks

January 13, 2012

Robert Kraft

OST file Issues

Two weeks ago I was experiencing corruption issue in my .ost file due to the size limitation and was unable to access my data. I was getting some unexpected error message. I tried scanpst/scanost, built-in utilities to repair corrupt .ost file but no success. After wasting 3-5 hours, one of my friend told me about this tool: http://www.recover-computerdata.com/ost-pst-converter.html

I was surprised with the results of the software. Although i had to spent some money, I got my all data back. Really sometimes third party applications play very important role for us.

January 15, 2012

Sujaine Suith

OSt to PST

OST to PST coverters are really very useful in case you struck in a situation where in you are not able to access teh Exchange Server and should rely on Outlook OST file for email recovery

March 7, 2012

Recover Deleted Files

Split PST File to Solve the Problem

One of the best Split PST Tool , which i ever used : http://www.recoverydeletedfiles.com/split-pst-tool.html


May 28, 2012


Ugly And Inefficient But Effective Option

When this process does not work -- and it did not work in my case--there's one last resort.

The Ugly And Inefficient But Effective Option:
1. Export Outlook elements (File>Import/Export), by folder, to uniquely-named .pst files (use the same name as the folder) to a location on disk.
2. Delete the offending gigantic (2GB) Outlook.pst file.
3. Import the individual elements (folders) from the individual .pst files, one-by-one. As you restore each folder, edit/delete/archive the contents of each folder until the size has been reduced to a reasonable size.
4. Repeat step 3 for each folder until all elements have been imported back into Outlook.
5. Set up a process to regularly-archive the larger folders so you don't have to repeat the whole process.

October 1, 2012

John Park

Repair corrupted outlook

Sometimes you need to run the Scanpst.exe more than 3 to 4 times to repair the pst file. But , you need to identify the version of MS Outlook that you are using. The size limitation for
outlook .pst file is 2 GB in MS Outlook 2002 and its earlier versions .

Various PST corruption situations and their solution http://pstrepairtool.blogspot.com

Also Scanpst.exe is not able to repair the .pst file which have the size of more than 2 GB. So it is necessary to know the version of the Outlook and reason for .pst file corruption. Once you get the information then either Scanpst.exe or use utility Tool can be used.

December 24, 2012

Jane Mitchum

Re: how to fix exceeded the size limit on your mailbox

To fix such type of issues, users need to use either a PST file splitter or an OST to PST converter tool.

May 14, 2013

Moretech Tony

thanks for the tip

Thanks for the useful tip. Hitting the 2GB limit seems to be the norm nowadays.

August 30, 2013

Outlook Expert

Repair Outlook Mailbox

SysTools OST Recovery for Outlook Mailbox Repair - On off-line mode Convert OST to PST files to easily archive Outlook emails from unreadable OST files.

October 26, 2013


Best easiest way to split pst

Best easiest way to split pst files use any third party utility. I would suggest you to choose below mentioned site, cheap, easy to interact, fast and accurate results.



January 22, 2014

Varun Thapa

Outlook Issue: PST file size


Here is blog post : http://nuctech.livejournal.com/3492.html I think this post is better solution with this outlook issue. I am also facing this type of problem with my outlook PST oversize problem, post is good for me and resolve my problem.

January 26, 2014


Outlook PST Repair provides

Outlook PST Repair provides Outlook users an easy workaround for PST file corruption. The tool effectively repairs corruption in your Outlook Personal Folders file, thereby recovering all your business emails containing crucial and sensitive information. The software follows a safe and lucid recovery approach when dealing with damaged or inaccessible Outlook data files. Get more details go with this link http://pst-mailrecovery.blogspot.com

February 22, 2014


As if have large PST files

As if have large PST files and you wish to reduce its size to avoid corruption then one best third party tool is SysTools split PST software(http://www.free.pstsplitter.org/) that help users to split any size PST into smaller parts . The software provides you four ways to split PST files i.e.
• Split PST by Date
• Split PST by Year
• Split PST by Folder
• Split PST by Size

Download free demo version that help you to check functionality of the software before investing money on it.

May 23, 2014


either you compact or split your pst file

This error message indicates that you have exceeded size limit on your Outlook mailbox. In this case, either you compact or split your pst file. Please check this article to know more about compact or split pst file: http://www.stellarinfo.com/article/compaction-vs-splitting-pst-file.php

May 24, 2014


Max File Size Registry Settings

Yesterday night when i was open my outlook, i was shocked because nothing is there, all previous data are lost due to oversize of pst file. Than my friend suggest me to see the blog post for easily recovering of entire lost data. Really this blog post help me for recover deleted outlook emails and all that. Thank you.

July 4, 2014


Most excellent outlook OST to

Most excellent outlook OST to PST recovery software helps you to recover OST file and convert outlook OST to PST free with full attachments- Inbox, sent mail, deleted mail, outbox, draft, tasks, notes, appointment, contacts, calendars, journals and other in few minutes.


August 12, 2014


Split PST files

Facing split PST files problem is not a big issues. If you want to split your heavy PST files , then I would suggest to kindly refer this given link: http://www.pstsplit.com By reading this tool, I assure that you will be able to resolve all sorts of split PST corruption or damaged issue without facing any difficulty.

January 22, 2015

pst repair

Resolve all Outlook Issues

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