What to do when Outlook AutoArchive doesn't work

Question

AutoArchive feature helps us manage the space in the mailboxes or on the e-mail server that were are using by automatically moving items to an archive location. These items can be Email messages, Calendar items, Tasks, Notes, Journal entries.
However, sometimes some users may find that Outlook AutoArchive doesn’t work as expected, this can be frustrating. In this article I’ll introduce some steps to troubleshoot this issue, I hope it will be helpful to those who meet the issue.
Always check the Default AutoArchive settings first
When AutoArchive is not working properly, the first thing we should do to troubleshoot the issue, is to make sure the AutoArchive setting is correct.
I’ll take Outlook 2013 for example, go to FILE tab -> Options -> Advanced -> AutoArchive -> AutoArchive Settings… button, we will see the AutoArchive window below:
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To make AutoArchive work, make sure the first checkbox has been selected and you have configured how frequently you want AutoArchive to run.
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If you select “Prompt before AutoArchive runs”, it will notify you before AutoArchive runs.
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If you want to delete expired items, select “Delete expired items (e-mail folders only)”.
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You should select “Archive or delete old items”, or only expired items will be deleted.
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Select “Show archive folder in folder list” to let the archive.pst appear in the folder list, which helps you find archived items easily.
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You can set the age of the items that you want to archive in the field of “Clean out items older than x”, the age is based on the last Modified date by default. I’ll introduce this later in this article.
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Then you need to decide whether to move old items to an archive .pst file, or permanently delete old items. Once you have your choice, you can apply these settings to all folders now and click OK to save the settings.
AutoArchive doesn’t work on one specific folder?
Apart from the default settings, each folder can be set with its own AutoArchive settings different from the global settings.
Right click on the folder and select Properties -> AutoArchive tab.
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You can select “Do not archive items in this folder” if you want this folder to be an exception of AutoArchive.
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If you select “Archive items in this folder using the default settings”, you will archive items in this folder using the default settings as it states, and the “Default Archive settings” button below is referring to the same AutoArchive
window as FILE -> Options -> Advanced -> AutoArchive -> AutoArchive Settings.
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If you want the AutoArchive settings for this folder to be different from the Default AutoArchive settings, select “Archive this folder using these settings”. The age of items can be set to a different one, you can even select a separate
.pst file to archive items in this folder. After everything is decided, click OK to save the settings.
Please note these settings are specific to each folder and are not applied to subfolders. Please configure the settings individually for each folder.
Modify the ArchiveIgnoreLastModifiedTime registry value
Outlook archive works based on the last modified date and time by default, if you
reply, forward, move, edit, save, import an item, the modified date will change, this may cause the AutoArchive not to archive the item.
If you want to let Outlook to archive items based on the received date, you need to set the ArchiveIgnoreLastModifiedTime registry value.
Since serious problems might occur if you modify the registry incorrectly, please back up registry in Windows first:http://windows.microsoft.com/en-US/windows7/Back-up-the-registry
To create the ArchiveIgnoreLastModifiedTime registry value, follow these steps:
Press Win + R to start Run, type
regedit in the Open box, and then click OK.
Locate and then click the following registry subkey:
HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Outlook\Preferences (Outlook 2010)
HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Outlook\Preferences (Outlook 2013)
On the Edit menu, point to New, click
DWORD Value, type ArchiveIgnoreLastModifiedTime, and then press ENTER.
Right-click ArchiveIgnoreLastModifiedTime, and then click
Modify.
In the Value data box, type 1, and then click
OK.
Exit Registry Editor and restart Outlook to make the registry take effect.
Once the registry key is added, check if Outlook archives the items properly. We can try manually archiving:
Go to FILE tab -> Info -> Cleanup Tools -> Archive, select the folders that you want to archive and archive criteria, click OK. Outlook should then archive the items based on the received date.
The Archive .pst file
As the Archive storage file, the .pst file may cause AutoArchive not working issue. If the .pst file is corrupted or too large, AutoArchive may not work as expected.
Scanpst.exe is an Inbox repair tool to fix Outlook Data Files like .ost and .ost files, it can be used to fix a corrupted .pst file. To find Scanpst.exe, browse to the locations below:
For Outlook 2013 on a 32-bit version of Windows:
<disk drive>\Program Files\Microsoft Office 15\root\office15
For Outlook 2013 on a 64-bit version of Windows:
<disk drive>\Program Files(x86)\Microsoft Office 15\root\office15
For Outlook 2010 on a 32-bit version of Windows:
<disk drive>:\Program Files\Microsoft Office\Office14
For Outlook 2010 on a 64-bit version of Windows:
<disk drive>:\Program Files\Microsoft Office(x86)\Office14
When the tool is opened, type the path and the file name of the .pst file or click Browse to locate the file by using the Windows file system, and then click Start.
More details about the tool can be found in this kb below:
How to repair your Outlook personal folder file (.pst)
http://support.microsoft.com/kb/272227/en-us
Another scenario is the .pst file is full. For Outlook 2003 and Outlook 2007 the default limit is 20GB and for Outlook 2010 and Outlook 2013 the limit is 50GB.
You won’t be able to add items to the archive .pst file when the file reaches 19GB or 47.5GB, once the .pst file gets too large, I suggest you create a new .pst file to archive the items.
One more thing to remember, don’t store the .pst file on the network share, which we always reminder our users of.
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Answer 1

Consider this program that tests whether a number is
prime.
[attempt to divide by each integer from 2 to n-1]At risk of lowering the signal to noise ratio, I
should point out that the algorithm given is just
about the worst possible.
I know that the point was to illustrate debugging
and not good prime test algorithms, and I disagree
with the correspondent who thought the post was
condescending.
Anyway, the java libraries have good prime testing
methods based on advanced number theory research that the
non-specialist is unlikely to know. Looking at the java
libraries first is always a good idea.
Even with the naive approach, dramatic improvements
are possible.
First, only try putative divisors up to the square root
of the number. For 999997 this is about 1000 times faster.
Next only try dividing by prime numbers. This is about
7 times faster again. The snag, of course, is to find the
prime numbers up to 1000, so there might not be much
advantage unless you already have such a list. The sieve
of Erastosthenes could be used. This involves 31 passes
through an array of 1000 booleans and might allow an
improvement in speed at the expense of space.
Sorry if I've added too much noise :-)