Unfortunately, v10 of the Mitel software has not improved accessibility and in many ways has made it worse. In particular:

No support for Windows High DPI mode (use of older Java runtimes?)
Very small fonts that cannot be adjusted – although ZoomText does a good job of scaling these, it works much better if the font is slightly larger to start with
Lack of contrast – the new “flat” look has removed some of the higher contrast elements, such as highlighted entries in the Phone Book search are now pale blue
All the icons are wireframe blue/grey (somewhat mitigated by the use of hotkeys)

Will this change in future SW updates??