activesync accept decline messages

[itsupport_ublox]

Hi all

we encounter some really strange issues with activesync, does somebody have a similar issue?

When Iphone or Windows Mobile 6.1 users use activesync, and accept a meeting or decline it, Outlook does not find that Meeting in its Calendar, even when it's there, looks like it cannot recognize the reply messages and associate them to a meeting.

Greets

Mike

[itsupport_ublox]

On Android HTC Phone it's the same, somehow it seems to have to do with the following fact:

when i invite user1, and he accepts/declines i get an answer-mail, however, Outlook seems to not find the related Calendar-entry, the only difference in reply Mail between Outlook reply and HTC Android/Iphone/Windows Mobile reply seems that in smtp-address of working one (outlook) it looks the following: SMTP:
first.lastname@maildomain.com in htc reply mail it looks the following: SMTP:
First Lastname <first.lastname@maildomain.com>

Greets

Mike