Thank you for your inquiry. Stellar Converter for OST offers solutions to convert inaccessible OST files to Outlook PST files. It can also recover deleted emails, as well as other mail components but the website does not clearly state whether it can assist in reclaiming space in Exchange. Your best bet is to sign up for a free demo with Stellar Converter and see what they say. For more information and to sign up for a demo, click here
Additionally, there are several third-party forum posts regarding reclaiming white space on Exchange but none are recent. You may want to contact Microsoft support directly regarding reclaiming space in Exchange by clicking here
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