"The messaging interface has returned an unknown error"

[stewrogers]

Hi

EV version is 8.0.3, client Outlook version across the estate is Outlook XP/2002. The user gets the error in the title. We have carried out a complete removal of the EV client from the users machine and reinstalled after a restart. This has not changed the issue.

We have also confirmed that the email, when removed from the vault, opens without any issue.

Any ideas?

Many thanks

[Mohawk_Marvin · Accepted solution]

Outlook 2002 is not supported with v8:

http://www.symantec.com/docs/TECH38537

Page 37 of the compat guide.

[Rob_Wilcox1]

Good spot MM.. also remember if you are going to stick with that version of Office, and use older client extensions, they only go forward 1 revision..  eg a 2007 client isn't certified against a 9 server.