hi

I have a number of users who has outlook 2013 who's inbox is slow to update most times they have to shut down outlook and re-open it to get the mails to come through. when I looked at her account outlook constantly trys to update the inbox byt downloading the mails from the server. I leave it running through the night and it completes but then you log in the next day and it starts to download the 3.5gb inbox again stopping any new mail coming in. we have the account set up to use cache mode and when I check the synchronisation tab in the inbox properties and look at the sync tab the number of files are the same. When we log into safe mode we have the same issue but the OWA it works fine. Ihave tried setting some up using autodiscover and some manually but both ways cause the same issue. I have deleted and reinstalled the profile and that has made no difference either. I have also tried toggling the cache setting but to no avail. The account is about 11gb in total

any help would be greatly appreciated

try online mode

There's a long discussion about it at the link below. I did some Googling and someone said the answer is in that thread, but I haven't had time to read all the way through it.

https://community.office365.com/en-us/f/158/t/59656?pi239031356=1

Also, is it creating a new .ost file every time you open it, or just "updating" the one you already have.

Hi,

By "I have also tried toggling the cache setting but to no avail", do you mean this issue continues when switching to online Exchange mode?

Do these users have any folder redirected? Such as My Documents folder?

Please check the drive:\Users\username\AppData\Local\Microsoft\Outlook folder and check if you can see multiple duplicate OST files.

Please provide above information so that we can fix the issue more efficiently.

Regards,

Steve Fan
TechNet Community Support