microsoft outlook 2010 with exchange 2010

Hi All

Some of my users outlook just stops working. Emails wont come in neither will it go out. I have exchange 2010 and exchange 2003 in co-existence. I have to close outlook and open again for it to start working. The other thing to get it working is to enter the password. There is a small icon at the right hand side in outlook that says about authentication. I have one send connector and one receive connector. Emails come in and go out as normal.

I would like to know what i can do to fix this problem permanently as it happens to users randomly. last weeke it happened to about 5 users.
Member_2_6474242Senior Systems AdministratorAsked:
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Jose Gabriel Ortega CastroCEOCommented:
You are using really old technologies.
My recommendation to you is that you migrate everyone to the exchange 2010, remove the coexistence, update to exchange server 2010 sp1 and migrate to exchange server 2016 or O365.

Exchange 2003 and 2007 are out of support this means that you are vulnerable and not receiving any updates or path since the end of support dates, and it's really a kind of irresponsible with the clients to have still systems in 2003.

To troubleshoot outlook you would need to check the outlook connectivity using this tool:

And check event viewer.

Moreover, it's really important that you update your systems ASAP
Member_2_6474242Senior Systems AdministratorAuthor Commented:
all mailboxes are on exchange 2010 sp3
Jose Gabriel Ortega CastroCEOCommented:
Ok so you can remove the coexistence and move on with a new coexistence with 2013 or 2016

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Member_2_6474242Senior Systems AdministratorAuthor Commented:
Hi Jose

How can i remove the coexistence. Is there any link guides or steps that i can follow, links would be really helpful
Member_2_6474242Senior Systems AdministratorAuthor Commented:
Jose Gabriel Ortega CastroCEOCommented:
Sorry, yes there are:

Or if you ask me, I'd say that you just need to uninstall the exchange server 2003, in that server with the programs and features from 2003.
he will take care of the removal process.

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