Domain user cannot accept calendar invitations

We are using Exchange 2007 and we are migrating to exchange 2013. User that is still on exchange 2k7 cannot accept calendar requests. Is there any solution for this?

Below is part of the email i get when i try to send calendar request to the user

There's a problem with the recipient's mailbox. Microsoft Exchange will not try to redeliver this message for you. Please try resending this message, or provide the following diagnostic text to your system administrator.
________________________________________
Sent by Microsoft Exchange Server 2007



Diagnostic information for administrators:
Generating server: exchangeservername.com
mail@usermail.com
#550 5.2.0 STOREDRV.Deliver: The Microsoft Exchange Information Store service reported an error. The following information should help identify the cause of this error: "MapiExceptionCallFailed:16.18969:88000000, 17.27161:000000004002000000000000B30B000000000000, 255.23226:00000000, 255.27962:02000000, 255.27962:07000000, 255.17082:B9FEFFFF, 0.26465:80030400, 4.21921:B9FEFFFF, 255.27962:FA000000, 255.1494:15000000, 255.1238:2D000000, 6.21970:0F01048040008F660F010480, 6.21970:0F010480020186670F010480, 6.21970:0F01048040008F660F010480, 6.21970:0F010480020186670F010480, 4.8916:E7FAFFFF, 4.14219:E7FAFFFF, 4.15243:E7FAFFFF, 4.12427:E7FAFFFF, 4.8916:E7FAFFFF, 4.14219:E7FAFFFF, 4.15243:E7FAFFFF, 4.12427:E7FAFFFF, 4.9867:E7FAFFFF,
Stavros CharalambousAsked:
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Will SzymkowskiSenior Solution ArchitectCommented:
I would try and move the users mailbox to another database on 2007 or just move it to your 2013 environment, to see if this corrects the issue.

Will.
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