Here is a output of current certificate deployment status.

/opt/zimbra/bin/zmcertmgr viewdeployedcrt
::service mta::
notBefore=May 6 18:06:00 2010 GMT
notAfter=May 6 18:06:00 2011 GMT
subject= /O=*.gmobility.com/OU=Domain Control Validated/CN=*.gmobility.com
issuer= /C=US/ST=Arizona/L=Scottsdale/O=GoDaddy.com, Inc./OU=http://certificates.godaddy.com/repository/CN=Go Daddy Secure Certification Authority/serialNumber=07969287
SubjectAltName= *.gmobility.com, gmobility.com
::service proxy::
notBefore=May 6 18:06:00 2010 GMT
notAfter=May 6 18:06:00 2011 GMT
subject= /O=*.gmobility.com/OU=Domain Control Validated/CN=*.gmobility.com
issuer= /C=US/ST=Arizona/L=Scottsdale/O=GoDaddy.com, Inc./OU=http://certificates.godaddy.com/repository/CN=Go Daddy Secure Certification Authority/serialNumber=07969287
SubjectAltName= *.gmobility.com, gmobility.com
::service mailboxd::
notBefore=May 6 18:06:00 2010 GMT
notAfter=May 6 18:06:00 2011 GMT
subject= /O=*.gmobility.com/OU=Domain Control Validated/CN=*.gmobility.com
issuer= /C=US/ST=Arizona/L=Scottsdale/O=GoDaddy.com, Inc./OU=http://certificates.godaddy.com/repository/CN=Go Daddy Secure Certification Authority/serialNumber=07969287
SubjectAltName= *.gmobility.com, gmobility.com
::service ldap::
notBefore=May 6 18:06:00 2010 GMT
notAfter=May 6 18:06:00 2011 GMT
subject= /O=*.gmobility.com/OU=Domain Control Validated/CN=*.gmobility.com
issuer= /C=US/ST=Arizona/L=Scottsdale/O=GoDaddy.com, Inc./OU=http://certificates.godaddy.com/repository/CN=Go Daddy Secure Certification Authority/serialNumber=07969287
SubjectAltName= *.gmobility.com, gmobility.com


We update certificated before a month ago and it is for 1 year. So it think certificates expire issue is not affecting. And this is wildcard certificates.

Thank you