I have an Avaya phone system that is sending voicemails to email. It all was working just fine on Exchange 2007 but we migrated to Exchange 2013 and now I get the emails still but the attachment is not attached. It is most likely not Outlook blocking it since our mobile phones are not able to see the attachments either.

This is how the message looks when i get it without the attachment:

This is a multi-part message in MIME format.

--{825c87c0-a11c-43af-9de4-650bb6bc488f}

Content-Type: text/plain;

charset=iso-8859-1

Content-Transfer-Encoding: quoted-printable

IP Office Voicemail redirected message

--{825c87c0-a11c-43af-9de4-650bb6bc488f}

Content-Type: audio/wav;

name="MSG00262.WAV"

Content-Transfer-Encoding: base64

Content-Disposition: attachment;

filename="MSG00262.WAV"

UklGRvozAgBXQVZFZm10IBAAAAABAAEAQB8AAIA+AAACABAAQUxDSEIBAABBdmF5YQAAAAAAAAAA

AAAAAAAAAAAAAAAAAAAAAEkAEjIyMzIAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAASm9zaCBI

b3BwZXI+Sm9zaCBIb3BwZXIAAAAAAAAAAADMWgjVAAAyMjMyAAAAAAAAAAAAAAAAAAAAAAAAAAAA

AAAAAAAAADIyMzIAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAEpvc2ggSG9wcGVyAAAA

AAAAAAAAAAAAAAAAAAAAAAAASm9zaCBIb3BwZXIAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAZmFjdAQAAACAMgIAZGF0YYAyAgALAOn/6f/1/wAAAAAA

AAsAAADp/+n/AAAXAAsACwAXAPX/6f/p/wAACwALAPX/FwALAOn/6f/1/xcA9f/1/wsA9f/p/+n/

AAAAAAAAAAALAAAA6f/p/wsAFwALAAsAFwALAOn/6f/1/wsACwD1/wsA9f/p/+n/AAALAPX/9f8L

AAsA6f/p/wAACwALAAAAFwD1//X/6f8AAAsACwD1/xcA9f/p/+n/9f8LAAAAAAAXAPX/9f/p/wAA/X/9f/p/wAAAAAAAAsACwAAAAAAAAD1//X/CwALAAsACwD1//X/CwD1//X/9f/1/wsA9f/p/+n/

9f/1//X/9f/1//X/AAAAAAAACwD1/wAAAAD1//X/AAAAAAAA9f/1/wAA9f8AAPX/9f8LAAsACwAL

AAsACwD1/wsA9f/p//X/9f/1/wsACwAAAAAA9f/1//X/6f/p//X/6f/1//X/9f/1/wsACwALAPX/

9f/1//X/9f/p/+n/9f8AAAAACwALAAsAAAALAAsAAAALAAsA9f/p//X/9f/1/wsA9f8LAPX/CwD1

/+n/6f/1/wsA9f/1/wsA9f/p//X/CwD1//X/CwD1/+n/9f8AAAAAAAAAAAsAFwD1//X/9f/1/wsA

9f/1//X/9f/1//X/9f/1//X/9f/1//X/AAAAAAAAAAAAAAAAAAAAAAsACwD1//X/9f/1//X/9f8A

AAAAAAAAAAAAAAAAAAAA9f/1//X/AAD1/wAAAAAAAAAACwAAAAsAAAAAAAsA9f8LAAsAAAD1//X/

9f/1//X/9f/1//X/6f/1/+n/9f8AAAAAAAAAAAAAAAD1/wAAAAAAAPX/AAAAAPX/AAD1/wsAAAD1

//X/9f/1/wsA9f/1/wsACwALAAsAAAAAAAAACwAAAAAACwALAAsA9f/p//X/9f/1/+n/6f/1/wsA

9f/1/+n/9f8AAAAAAAD1//X/AAALAAAA9f8AAAAACwAAAPX/9f8AAAAAAAAAAAAACwAAAAsACwDp

//X/CwD1//X/6f/1//X/9f/1/+n/9f8LAAsA9f/1//X/9f8LAPX/9f/p//X/AAD1//X/9f8AAAAA

AAAAAAAAAAAAAAsAAAAAAAAAAAALAPX/CwALAPX/9f/1//X/9f/p//X/9f/1//X/9f/1//X/CwD1

//X/CwD1//X/CwD1//X/CwD1//X/9f/1//X/6f/1//X/9f/1//X/9f8AAPX/CwALAAsAAAAAAAsA

AAD1/wAAAAALAAsA9f/1//X/AAAAAPX/9f/1//X/9f/1//X/9f8AAPX/AAALAAAACwD1/wsACwD1

/wsACwD1//X/9f/1//X/9f/1/wsA6f/p//X/9f8AAAAA9f/1//X/CwAXAAsACwAAAAsACwALAAsA

6f/p/+n/CwAAAPX/CwALAAsA9f/p//X/CwALAPX/9f8LAAsA9f/p/+n/CwALAPX/6f/1/wsA9f/1

//X/9f/1//X/AAAAAAAAAAD1/wAAAAALAAsAAAAAAAsA9f/1/wsACwD1//X/9f/p/+n/9f/1//X/

AAAAAAAAAAAAAAAACwAAAAsAAAD1/wAA9f8AAAAACwALAAsA9f/p//X/9f/1//X/CwALAPX/CwAA

AAAA6f/1//X/6f/p//X/CwD1//X/9f/1//X/AAAAAAAAAAAAAAsACwALAPX/9f/1//X/9f/p//X/

9f/1//X/AAAAAAAAAAAAAAAAAAAAAAAACwAAAAAA9f/1//X/9f8AAPX/AAAAAAsAAAAAAAAACwAL

AAsAFwAAAAAA9f/p//X/AAD1//X/9f/1/+n/6f/1//X/9f/1//X/9f/1/wsACwALAAsAAAAAAAAA

AAAAAAAAAAAAAAsACwD1/wsACwD1//X/6f/p/+n/9f/1/+n/9f8LAAsA6f/1/xcACwD1/+n/CwAX

ABcAAADp/+n/FwAuAAsA6f/p/+n/FwALAOn/6f/p//X/9f/1//X/9f/1//X/CwD1//X/9f/1//X/

CwALAOn/9f8AAAAACwAAAPX/AAD1/wsACwALAPX/9f/1//X/CwDp//X/AAAAAAAAAAAAAPX/9f8A

AAAAAAAAAAAA9f8AAAsAAAALAAAACwALAPX/CwD1//X/9f/p/wsACwD1//X/9f/1//X/9f/1//X/

6f/1//X/9f8LAPX/AAALAPX/CwAAAAAACwAAAAsA9f8LAPX/6f8XAPX/9f8LAOn/9f/1//X/9f/1

//X/9f/1/+n/9f/1//X/AAAAAAAAAAAAAAAAAAAAAAAACwAAAAsAAAD1//X/9f/1//X/9f/p//X/

AAAAAAsA9f/1/wsA6f8LAPX/6f8XAPX/9f8LAOn/9f/1/+n/CwD1/wAAFwD1/wAAAAAAABcACwD1

/wsA9f/1//X/9f8LAPX/6f/p//X/6f/1/wAAAAALAPX/CwAAAPX/CwAAAAsAAAAAAAsA9f/1//X/

9f8LAPX/FwDp//X/CwDp//X/9f/1/wsA6f/1//X/6f8AAAsA9f8LAPX/

This is how the message looks when i get it without the attachment:

This is a multi-part message in MIME format.

--{825c87c0-a11c-43af-9de4

Content-Type: text/plain;

charset=iso-8859-1

Content-Transfer-Encoding:

IP Office Voicemail redirected message

--{825c87c0-a11c-43af-9de4

Content-Type: audio/wav;

name="MSG00262.WAV"

Content-Transfer-Encoding:

Content-Disposition: attachment;

filename="MSG00262.WAV"

UklGRvozAgBXQVZFZm10IBAAAA

AAAAAAAAAAAAAAAAAAAAAEkAEj

b3BwZXI+Sm9zaCBIb3BwZXIAAA

AAAAAAAAADIyMzIAAAAAAAAAAA

AAAAAAAAAAAAAAAAAAAAAAAASm

AAAAAAAAAAAAAAAAAAAAAAAAAA

AAAAAAAAAAAAAAAAAAAAAAAAAA

AAsAAADp/+n/AAAXAAsACwAXAP

AAAAAAAAAAALAAAA6f/p/wsAFw

AAsA6f/p/wAACwALAAAAFwD1//

9f/1//X/9f/1//X/AAAAAAAACw

AAsACwD1/wsA9f/p//X/9f/1/w

9f/1//X/9f/p/+n/9f8AAAAACw

/+n/6f/1/wsA9f/1/wsA9f/p//

9f/1//X/9f/1//X/9f/1//X/9f

AAAAAAAAAAAAAAAAAAAA9f/1//

9f/1//X/9f/1//X/6f/1/+n/9f

//X/9f/1/wsA9f/1/wsACwALAA

9f/1/+n/9f8AAAAAAAD1//X/AA

//X/CwD1//X/6f/1//X/9f/1/+

AAAAAAAAAAAAAAsAAAAAAAAAAA

//X/CwD1//X/CwD1//X/CwD1//

AAD1/wAAAAALAAsA9f/1//X/AA

/wsACwD1//X/9f/1//X/9f/1/w

6f/p/+n/CwAAAPX/CwALAAsA9f

//X/9f/1//X/AAAAAAAAAAD1/w

AAAAAAAAAAAAAAAACwAAAAsAAA

AAAA6f/1//X/6f/p//X/CwD1//

9f/1//X/AAAAAAAAAAAAAAAAAA

AAsAFwAAAAAA9f/p//X/AAD1//

AAAAAAAAAAAAAAsACwD1/wsACw

ABcAAADp/+n/FwAuAAsA6f/p/+

CwALAOn/9f8AAAAACwAAAPX/AA

AAAAAAAAAAAA9f8AAAsAAAALAA

6f/1//X/9f8LAPX/AAALAPX/Cw

//X/9f/1/+n/9f/1//X/AAAAAA

AAAAAAsA9f/1/wsA6f8LAPX/6f

/wsA9f/1//X/9f8LAPX/6f/p//

9f8LAPX/FwDp//X/CwDp//X/9f