WiFi is distinguished into 2.4 GHz and 5 GHz, the 2.4G Hz signal transmission distance is farther than 5 GHz, but slower than 5 GHz, 5 GHz although the signal transmission distance is shorter, but the speed can be faster. To ensure the best wireless signal, set the four detachable antennas as flush DNS and re-sync Outlook below suggested image. Below we take RT-AC88U for example, for other models, please refer to user manua "Cannot start Microsoft Outlook. Cannot open the Outlook window. Th...