Problem after migrating mailbox from Exchange 2010 to Exchange 2013

Hi all,
I try to explain better my situation.

Last weekend I migrated all the mailbox from Exchange 2010 to Exchange 2013.
The migration was succesfull but today I found some minor problems.

One problem is that if I forward a message, this message have not the header from original sender and also the sender is not me but the external account xy that have send the original message.
What a strange behavior! All my client have this problem (I thinked only Outlook 2010 and instead Outlook 2013 too). See the image attached (Cristian is the user that forwarding e-mail from g...@bluewin.ch) . What can I do? Before migrating mailbox to new Exchange, this did not happen.

Another problem is that the new e-mail received don't appear in bold (to read) but they are as if it had already been read.

forwardingBoh! Any idea?
SimonaIT ManagementAsked:
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Will SzymkowskiSenior Solution ArchitectCommented:
You said this happens for all users, however if you create a new Outlook profile do you get the same experience?

Will.
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SimonaIT ManagementAuthor Commented:
Hi Will,
Good question! Today I try to create a new account and I answer to you.
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SimonaIT ManagementAuthor Commented:
Hey Will,
I added a new mailbox in Exchange 2013. This has created a new user on AD.
I tried to configure the new account on outlook but the server not responding (XC2013), only if I write the old server (XC2010) the autodiscover find the configuration fot this user.

Another strange is that if I disable the cache mode, I close and reopen Outlook but it tell me that don't find the group directory etc..

I leave the cache mode and I reopen Outlook, that's work.

Now I try to send an email but I have an error. Unfortunately is in italian language:
"Operazione non riuscita. Errore sconosciuto dell'interfaccia di trasferimento messaggi. Se il problema persiste, riavviare Outlook. Impossibile risolvere il destinatario".

What a caos.

The log from IIS on server have some error due to exchange.
I think I made a mess with the configuration. I don't know how to fix it.
What can I do? Uninstalling all the exchange 2013 and reinstall it? Or..?
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Will SzymkowskiSenior Solution ArchitectCommented:
I would start by checking to make sure that your virtual directories are correct and that you have your Autodiscover set correctly. I have created a HowTo for configuring Exchange Split DNS and Virtual Directories.

Configure Split DNS and Exchange Virtual Directories
http://www.wsit.ca/how-tos/exchange-server-2/configure-split-dns-and-exchange-2013-virtual-directories/

Will.
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SimonaIT ManagementAuthor Commented:
Hi Will,
I'm sorry for my ignorance but I'm locked at the first sentence:
"After you have purchased your Exchange UCC/SAN certificates and enabled them on your Exchange server".
I have not purchased a certificate, I must do it? What is that?
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Will SzymkowskiSenior Solution ArchitectCommented:
What are you using for your certifiacte? I would recommend using a 3rd party UCC Cert with all of your DNS names required i.e. mail.domain.com, autodiscover.domain.com.

Will.
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SimonaIT ManagementAuthor Commented:
Ehmmm I don't know. I don't use certificate, it's possible?.

I'll explain my environment.

Our domain controller is an old SBS 2003. Next year I definitely want to change it!
I started with the "detachment" of Exchange. DHCP, AD, DNS ecc.. still work on SBS 2003.

I installed a new VM windows server 2012 std with Exchange 2010 and I migrated all the mailbox and PF on it. All works fine and the client automatically view the new exchange without problem.

I don't have a license of Exchange 2010 and I use the 180 day trial.
But I have a license of Exchange 2013 std then I decided to install it on a new server and migrating from 2010 to 2013.

Exchange 2013 require certificate? And Exchange 2010 too?
I'm a fledgeling..
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SimonaIT ManagementAuthor Commented:
Ok, after several attempts I understand where the problem is but I did not understand why.

We have an external hosting for domain and mail management.

All the client, on their Outlook, have two account. One is Exchange and the other is a POP.
We have always worked in NON cache mode with Exchange but for some strange reason, with Exchange 2013 and client configured so, this does not work properly.

I have switched on the cache mode on all the client and now the e-mail no longer have problems.
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SimonaIT ManagementAuthor Commented:
This work!
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