Outlook 2013 set cached mode "Mail to keep offline" to All for existing Outlook profiles via GPO or registry changes

Question

We recently migrated from Office 2010 to Office 2013.  An annoying change is Outlook's "Use Cached Exchange Mode" setting that changes the previous setting of all email to partial email based on how old emails are.  This is confusing
for end users because if they have a 1GB mailbox size limit and they look at the properties of their mailbox, it shows the cached amount which is always then less than the full amount.  While they have a 1GB limit, the properties of their mailbox
might say 700MB because that's all that is cached, but meanwhile they can't send because they are actually over 1GB on the server side.
I want to set this cache setting to "All" for EXISTING profiles and new profiles.  I think I can do it with GPO for new profiles, but I don't see a way to set it for existing profiles.  I assume I have to do this with a registry setting.

Answer 1

Hi,
The cached mode Sync Slider setting is maintained in the Outlook profile settings in the Windows registry. If you want to administer this setting via group policy, you can use the group policy templates, which are available from the Microsoft Web site. The
group policy template files are Outlk15.admx and Outlk15.adml. If you use group policy to manage this setting, the following registry data is utilized by Outlook.
Key: HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\15.0\Outlook\Cached Mode
DWORD: SyncWindowSetting
Value: integer value (Decimal) specifying the number of months (use only the following values)
0 = All (entire mailbox)
1 = One month of mailbox items
3 = three months of email items
6 = six months of email items
12 = twelve months of email items
24 = twenty-four months of email items
Refer from
http://support.microsoft.com/kb/2733062
Hope this will be helpful for you.