Accepting Outlook Meeting after modification

User 2 sends User 1 a meeting appointment with both users being internal.  User 1 accepts meeting and can send response.  If User 2 then modifies the appointment and User 1 accepts they are unable to send an acceptance and Outlook comes up with "could not complete the operation one or more parameters are invalid"

If User 1 clicks accept and edit response  we can manually put in the user and then send.

I have recreated Outlook Profile, flush suggested contacts, recreated nk2 file however it still doesn't work.  and it only affects these 2 users.

Exchange 2010 SP3 and Outlook 2007 with latest SP and patches
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Clark KentSoftware Engineer cum BloggerCommented:
Dear OceanIt,

I think there is issue with navigation pane, reset it settings by using "outlook.exe /resetnavpane" command in run box and see the results.

Feel free to response back!!

Thanks & Regards
Peter Baris
OceanITAuthor Commented:
Hi Peter,

Just tried that and unfortunately it still occurs.
Clark KentSoftware Engineer cum BloggerCommented:
Have u tried repair on PST file?

Perform a repair using scanpst.exe.
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OceanITAuthor Commented:
its online Exchange with no pst, exchange cache mode disabled as its on a S2008R2 RDS Server
Gareth GudgerSolution ArchitectCommented:
If User 1 clicks accept and edit response  we can manually put in the user and then send.

Just to confirm. The user is missing until you enter them? Does the same occur if you do this in Outlook Web App?

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OceanITAuthor Commented:
Yes its missing - I haven't tried from OWA as they don't use this however I will arrange a time today with the client to test this.
OceanITAuthor Commented:
hi just to confirm OWA worked so it rules out configuration.  so its point me towards his actual profile as I have created a new outlook profile and nk2. thanks for narrowing down and hopefully new profile will resolve this.
OceanITAuthor Commented:
Pointed me in the right direction and will resolve by creating a new profile
Gareth GudgerSolution ArchitectCommented:
Awesome. Glad you got it resolved.
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