Great news everyone! You can now get a did not open report for the last 90 days or over your last 500 campaigns, using our new segmentation feature.
To create a segment, you will need to be on your contacts tab. In the sub tab on the contacts page, you should see the new option "segments".

Click "create segment" and you will be brought to the creation flow.

Select the options of: ‘Did not open’ ‘any email’ 'in the last' and then '90 days'. You also have the option to select a custom timeframe going back 5 years. However, segments is only looking at the last 500 campaigns. If you have sent more than 500 campaigns in the last 5 years,it will stop when it gets to the 500th campaign.
Last 90 days:

Last 5 years (500 campaign limit):

Once you save and preview, save the segment to a list by clicking the three dots to the right of the segment name and selecting ‘Add to List’.

We recommend sending out a 'We don't want to say goodbye' email to your did not open segment to see who does and does not want to continue to receive your emails. Segmentation is still undergoing development so expect to see more functionality and exciting updates in the future. We hope you continue sharing your feedback as you try out our new segments feature!