UPgrade from EV8 SP4 TO

 UPgrade from EV8 SP4 TO EV11

We currently use version 8.0 SP4 with Exchange 2007 and want to upgrade to the latest version of Evault for on a new exchange version (Exchange 2013).

My plan is to follow the following steps

       1) From Ev8 to EV9 32 bits (in place upgrade)

       2) From EV9 32 Bits to Ev9 64 Bits (new servers) minimum Windows 2008 R2 x64  SP2

       3) Migrate SQL 2005 SP4 to SQL Server 2008 x64 enterprise edition R2 SP2 ( os Windows 2008 R2 64-bit x64 Enterprise)

1. From Ev9 64 Bits to EV10 64 Bits ( in place upgrade)
2. From Ev10 64 bits EV 11 64 bits ( in place upgrade )

Please give me you advice about my plan