Hi there,

I and a few of my colleagues seem to have an issue with Outlook 2010 whereby if we leave it inactive for a while and then come back to it, then it comes up and says it is connecting to Microsoft exchange and then seems to hang there for a while before proceeding. I find this happens if I leave it and then try to reply to a mail. It hangs when I click send.

I have opened my connections for Outlook and seen that I have 2 Directory connections and 2 Mail connections. When this hanging happens the Directory services show and re-connecting. The Mail connections stay as established.

I have tried disabling and re-enabling Encryption of data between Microsoft Outlook and Microsoft Exchange. But it happens in both scenario's. I have removed all PST files and also ensured that I have as minimal e-mails in my mailbox as possible. I have also tried to re-create the mail profile, but it still happens even then.

Exchange is running Version 14.3.195 and Outlook is running with all the latest windows updates and Office service packs applied.



I have tried clicking Send/Receive when coming back to it after a while and it seems to do it. In fact new mails regularly appear throughout. But as soon as you open one and try to click send that is when it happens.

Any help would be greatly appreciated.

I have run Outlook in Safe mode and it does still happen. Running through that KB https://support.microsoft.com/en-us/kb/2695805 article I did as it suggested. No Add-ins, still happens. Outlook in non-cached and cached mode, still happens either way.



Oddly enough though, when i put it in safe mode it seemed ok for a few days, but then it started up again this week.

Running latest version of Outlook 2010, all SP's and updates applied. Get the same issue on a pc with no PST files as one with PST files attached.

Running a Gen 3 SSD. The only Add-ins that I have on all my domain pc's are Exchange Add-in and Kaspersky add-in. But this issue predates Kaspersky.



I have also tried re-creating a new Mail profile with no joy.





Any other suggestions?

Just a FYI for anyone having the same issue. Found that the firewall between the 2 servers had a TCP timeout of 60 minutes. So this was causing Outlook to have to re-connect after the period of inactivity.



Increased the TCP timeout for the exchange application within the firewall and now the problem has gone away!