Hotfix suggestions for increasing PST file size in Outlook 2007
November 08, 2020 by Owen Faunce
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This guide describes some of the possible causes that might cause the .pst file to grow in size in Outlook 2007. It then presents some possible fixes that you can try to resolve the issue. The maximum size for a .pst file in Outlook 2007 and Outlook 2003 is 20 GB.
Step 1. Open the registry editor.
1. Open the Run command, type Regedit in the Run search box and press Enter.
Step 2. Change the size limit for Outlook PST through the registry.
1. Look in the Registry Editor in the left pane and navigate under Computer to the following registry path that matches your version of Outlook:
For unique users:
- Outlook 2013: HKEY_CURRENT_USER \ Software \ Microsoft \ Office \ 16.0 \ Outlook \ PST
- Outlook 2013: HKEY_CURRENT_USER \ Software \ Microsoft \ Office \ 15.0 \ Outlook \ PST
- Outlook 2010: HKEY_CURRENT_USER \ Software \ Microsoft \ Office \ 14.0 \ Outlook \ PST
- Outlook 2007: HKEY_CURRENT_USER \ Software \ Microsoft \ Office \ 12.0 \ Outlook \ PST
- Outlook 2003: HKEY_CURRENT_USER \ Software \ Microsoft \ Office \ 11.0 \ Outlook \ PST
For administrators: (via group policies)
- Outlook 2013: HKEY_CURRENT_USER \ Software \ Policies \ Microsoft \ Office \ 16.0 \ Outlook \ PST
- Outlook 2013: HKEY_CURRENT_USER \ Software \ Policies \ Microsoft \ Office \ 15.0 \ Outlook \ PST
- Outlook 2010: HKEY_CURRENT_USER \ Software \ Policies \ Microsoft \ Office \ 14.0 \ Outlook \ PST
- Outlook 2007: HKEY_CURRENT_USER \ Software \ Policies \ Microsoft \ Office \ 12.0 \ Outlook \ PST
- Outlook 2003: HKEY_CURRENT_USER \ Software \ Policies \ Microsoft \ Office \ 11.0 \ Outlook \ PST
Note. If the PST key is missing under the Outlook key, you need tocreate it manually. To do this:
a. Right-click the Outlook button and select New> Button from the menu that appears.
b. Enter a name on the new key: PST.
2. Double click the PST button and find these two (2) values in the right pane: *
- MaxLargeFileSize
- WarnLargeFileSize
Note. If the above values cannot be found in the registry, you will have to create them manually. To do this:
a. Right click in the right pane and select from the menu that appears: New> DWORD Value
b. Enter a name for the new value: MaxLargeFileSize
in. Repeat the above process (2a) and create a new DWORD value named: WarnLargeFileSize
3. Double-click the MaxLargeFileSize value, select Decimal, and enter the new file size in megabytes (MB) into these values. *
Reminder:
- In Outlook 2003 and 2007, the default size limit for Outlook PST is 20 GB, so you must specify a size greater than 20 GB.
- In Outlook 2010, 2013, and 2016, the default PST file size limit is 50 GB, so a size greater than 50 GB must be specified.
Note. 1 GB = 1024 MB, 30 GB = 30720 MB, 50 GB = 51200 MB, 70 GB = 71680 MB, 100 GB = 102400 MB
In our example, we are increasing the size limit for Outlook PST to 30 GB for Outlook 2003 and 2007 and 100 GB for Outlook 2010, 2013, 2016)
* In our example: 30720 for Outlook 2003 and 2007 and 102400 for Outlook 2010, 2013 and 2016.
4. Then double-click the "WarLargeFileSize" value, select "Decimal" and enter the new size of the warning file in megabytes (MB) in the data value. *
Warning: This value must represent at least 95% of the MaxLargeFileSize (MaxLargeFileSize X 95%)
* In our example: 30720 x 95% = 29184 for Outlook 2003 and 2007 and 102400 x 95% = 97280 for Outlook 2010, 2013 and 2016.
5. Close Registry Editor and you're done!
What Other Options Do Users Have?
The above method is best for increasing the maximum size of PST and OST files. However, if you focus on large files, it can slow you down or cause damage. You can also split or compress PST. With professional method, users can split PST files according to their needs, compress PST files, secureIt is important to reduce their size and effectively delete large PST files. Shoviv PST Management Suite is a versatile all-in-one PST software that expertly manages all PST tasks. Download it and try the free trial / demo to see how it works
May 2021 Update:
We now suggest using this software program for your issue. Also, Reimage repairs typical computer system errors, defends you from file loss, malicious software, computer system failures and optimizes your Pc for maximum performance. You can fix your Pc challenges swiftly and prevent others from happening by using this software:
- Step 1 : Download and install Computer Repair & Optimizer Tool (Windows 10, 8, 7, XP, Vista - Microsoft Certified).
- Step 2 : Click on “Begin Scan” to uncover Pc registry problems that may be causing Pc difficulties.
- Step 3 : Click “Repair All” to fix all errors.
Download a free PST Management Suite trial to learn how to delete large PST files.
| Name | Enter | Valid data area | Standard |
|---|---|---|---|
| MaxFileSize | REG_DWORD | 0 - 00000001 - 0 - 0000C800 | 0 - 7BB04400 2,075,149,312 (1,933 GB) |
| WarnFileSize | REG_DWORD | 0 - 00042400 - 0 - 7C004400 | 0–74404400 1 950 368 768 (1 816 GB) |
| MaxLargeFileSize | REG_DWORD | 0 - 00000001 - 0 - 0000C800 | 0 - 0000C800 51 200 (50GB) |
| WarnLargeFileSize | REG_DWORD | 0 - 00000000 - 0 - 0000 BE00 | 0 - 0000BE00 48.640 (47.5 GB) |
