Here are some document notes regarding Migration from LX - MXe.
Mxe Database Migration Guideline
This document is to provide a general guideline to determine which 3300 programming data need to be de-programmed before migrating database between 3300 platform types. The reason for these pre-migration steps is mainly due to different types of hardware level support such as AMB, the number of voicemail ports, compression, the build-in L2 switch, to name a few. This document is not intended to supersede the software release note. If one is migrating across major software release, Mitel strongly recommends reviewing all release notes and the corresponding pre-software upgrade checklist accordingly.
Pre-Setup Conditions
a> Before migrating database to a new platform, IP address assigned to RTC on the new platform MUST be set to be the same as IP address of the original platform.
b> System Name is recommended to be the same, which is programmed in Network Element Assignment
c> Sys ID on platform LX and I-button used on Cx/Cxi/Mxe/AX are not interchangeable.
d> Software version is 7.1.x.x (or higher)
e> DSP may be moved from the existing platform to new platform.
Migrate from: LX (256, or 512 RAM), 250 User platform, 700 User platform
Pre-migration Steps
There is no requirement to pre-delete any programming from LX database; i.e. one can convert LX database to Mxe.
Post –migration step
a> After LX database restore, access System IP Configuration and program up the L2 switch IP address. The controller must be rebooted after changing the L2 switch IP address to make it effective.
b> If one is migrating from a platform with more than 250 IP device/user licenses, it is recommended that E2T card be installed on Mxe.
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Occam's Razor - All things being equal, the simplest solution is the right one.