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Invision Community has had a question and answer mode for a good few years now.
This mode transforms a forum into a formalized way to handle your member's questions. Members can upvote answers, and the topic starter and your community management team can mark a reply as the "best answer".
This is great when you want to add rigour to specific forums which encourage your members to find solutions.

The existing "QA" mode
But how about a way to mark a topic as solved without transforming the look and feel of the forum?
We get asked this a lot.
Happily, it's now a feature just added to Invision Community 4.5! Those with a long memory will recall we had something very similar way back in Invision Community 3.

The new "mark as solved" feature
This new feature allows the topic starter or your community management team to mark a post as the solution. This highlights the post within the topic as well as adding an icon to the listing views. 

The green tick notes that the topic has a solution
In addition, it also increases the member's solved count, which is displayed under their name in the post and even in a draggable widget that shows members with the most solutions. We have also added a new filter to the existing post and topic feed widgets to allow only items with a solution to be shown, so you can create a "Recently solved" feed.

The new widget
Finally, a notification is sent to the author of the post that is selected as the best answer, so they're made aware that their helpful content has been spotted.

Let your members know their content was useful
We hope you enjoy these changes and look forward to allowing your community to find answers quickly, and to reward the members that provide them.

For a long time, Invision Community has supported a Question and Answer mode within the Forums application which allows a reply to be flagged as the "best answer" to the question posed. With the release of 4.5, we also introduced a way to allow topics to be marked as "solved" which introduces similar functionality without transforming the look and feel or other behavior of the forum itself.
Based on the popularity of this new addition in 4.5, we have made some further improvements to solved topics and answered questions in our next release.
Notification to topic/question starter
While notifications were available to the poster who answered a question or solved a topic with the release of 4.5, this release also adds notifications for the topic or question starter so that they can be made aware that an answer is available to their question.

Topic and question starters now get notifications for solutions
AdminCP Statistics
Solved topics and answered questions provide for measurable statistics that can help you determine the health and direction of your community, particularly for support communities. To that end, we have introduced two new content statistic blocks that can help you measure how well areas of the community that support answers and solutions are faring.

New AdminCP statistics
You can now quickly see the percentage of topics/questions that have been solved (relative to the total number posted in areas that support solutions), as well as the average time it has taken for a solution to be marked on a topic or question (relative to the time the topic or question was initially posted). These statistic blocks support time period filter, time period comparisons, and node filtering to narrow down the statistical data for your specific needs.
User profile enhancements
User profiles now show the number of solutions the user has posted, and also allows you to view all of those solutions, in a manner very similar to reputation.

Prolific problem solvers will now be called out boldly

Answers can be quickly found on user profiles
These improvements should help reward the most helpful users on your community by giving them more prestige and helping other users find their answers quicker.
Collectively, we hope that these changes make the question and answer and topic solution features in the Forums application more useful for your community members, and the administrators behind the community.