Here is the scenario: User (me) has Office 365 Exchange (P plan). User has 10GB of mailbox data. User has desktop, laptop, and Surface Pro. User wants full access to entire Exchange repository on all devices using native Outlook - not web interface. User sets up Outlook to connect to Office 365 Exchange using cached mode on all devices. This setup does work and achieves user objectives. [One aside: user uses tasks extensively and needs full Outlook, not Windows 8 Mail App, to access tasks].
However, user runs out of space on C:\ drive on desktop. User moves .ost files to D:\ drive. User creates symlink in standard location to point to .ost on D. This works on desktop. User then discovers that the laptop and Surface can no longer connect to Exchange because the .ost file at c:\users\username\AppData\Local\Microsoft\Outlook\ is not valid.
My current thought is to replace my 120GB SSD on my desktop with a 240GB C:\ drive and return the .ost files to their original location.
Is this the best solution?
The implication and side effect will be that all my devices that carry full cached .ost files will need to allow up to 10GB (and up to 25GB or more in future as my repository grows) on the C drive for .ost files.
A large Exchange mailbox repository is important to me but this is not elegant or pleasing. Is there a good alternative? Am I missing something?
Update to issue:
It turns out that the failure of the other instances of Outlook 2013 to connect to Exchange only occurs if the computer with the symlinked .ost file is also connected. If Outlook is closed on that computer the other computers can then connect.
The page entitled "Choose between Cached Exchange Mode and Online Mode for Outlook 2013" on TechNet at technet.microsoft.com/en-us/library/jj683103.aspx says that a scenario to use Online Mode instead of cached mode is when you have:
- Very large mailboxes on computers that have insufficient hard disk space for a local copy of the mailbox.
A way to interpret that would be to say: If I really want Cached Exchange Mode I'd better have enough space on C:\ to handle the storage.
So, it seems that there is a narrow issue: the symlink solution to moving the .ost file on a single machine from the C:\ drive to another drive has the side effect of interfering with the functioning of other instances of Outlook 2013 on other computers that try to connect to the same Exchange mailbox at the same time as the computer with the symlinks.
In principle Microsoft should treat this as a bug and fix it in the future.