Up until recently, if you sold an upgrade to a customer running old hardware and the new hardware was an MXe-III you had to jump thru many hoops and alternate hardware to upgrade the system thru the release 4.0 stage. (4.0 was not supported on the MXe III)
Thankfully, Mitel has addressed this serious issue with the release of 4.0 SP4 that can now be loaded onto an MXe III.
Be aware that, if you use the SWI tool, you must use the version that comes with 4.0 SP4 for this to be possible otherwise the SWI will tell you that it cannot be done.
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What's most important is that you realise ... There is no spoon.
Thankfully, Mitel has addressed this serious issue with the release of 4.0 SP4 that can now be loaded onto an MXe III.
Be aware that, if you use the SWI tool, you must use the version that comes with 4.0 SP4 for this to be possible otherwise the SWI will tell you that it cannot be done.
**********************************************
What's most important is that you realise ... There is no spoon.